mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Tan, beige, and white; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Tan, beige, and white
Luster: Vitreous to waxy (when weathered)

Identified June 19, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Tan, beige, and white; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed from hydrothermal veins or as a secondary mineral in igneous rocks, then weathered, transported by water, and rounded through erosion in riverbeds or coastal environments over millions of years.

Uses & applications

Landscaping, aggregate for concrete, manufacturing glass and ceramics, and as tumbled decorative stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These rounded shapes are the result of thousands of years of tumbling in water, which acts as a natural rock tumbler.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and smooth, water-worn exterior. Commonly found in river beds, beaches, and glacial deposits.